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Posted: 1/16/2021 8:14:48 AM EST
Change the 308 recoil spring to something lighter? I bought a FM9 pistol and it drives me nuts with how hard it is to charge the gun. I was looking to see what others have done with theirs.
Link Posted: 1/16/2021 8:30:17 AM EST
Originally Posted By 243savage:
Change the 308 recoil spring to something lighter? I bought a FM9 pistol and it drives me nuts with how hard it is to charge the gun. I was looking to see what others have done with theirs.
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FM has some "interesting" marketing.  They recommend a 308 recoil spring to "help with feeding", then tell everyone that they need to use their proprietary length "slightly shorter than everyone else's extended-length buffer" to prevent trigger reset issues (likely caused by the 308 spring moving the bolt carrier too quickly).

You should be able to install a standard carbine spring and, if the gun is engineered properly, it will feed fine.  If not, the barrel can be sent to Rudy @ Macon Armory and for a nominal fee he can recut the feed cone so it will feed practically anything with a standard spring, like they all should.
Link Posted: 1/16/2021 1:56:32 PM EST
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Originally Posted By Droppoint:


FM has some "interesting" marketing.  They recommend a 308 recoil spring to "help with feeding", then tell everyone that they need to use their proprietary length "slightly shorter than everyone else's extended-length buffer" to prevent trigger reset issues (likely caused by the 308 spring moving the bolt carrier too quickly).

You should be able to install a standard carbine spring and, if the gun is engineered properly, it will feed fine.  If not, the barrel can be sent to Rudy @ Macon Armory and for a nominal fee he can recut the feed cone so it will feed practically anything with a standard spring, like they all should.
View Quote


Yep, FM operates like pharma.  Create the cure and then invent the disease.
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